VOIP Over EV-DO Rev. A Put To Test
Jun 8, 2006, 1:32 PM by (staff)
Qualcomm yesterday announced it had successfully tested making calling using Voice over IP (VOIP) on a CDMA EV-DO Revision A network. The tests involved 62 simultaneous calls in a single 1.25 MHz channel using SIP-based voice clients. SIP is a common VOIP protocol used by many internet phones including those running Gizmo Project. Qualcomm and CDMA operators are looking to VOIP because when a channel is used for EV-DO data, it cannot be used for voice calls. Not only would VOIP over Revision A networks allow carriers to use their spectrum more efficiently by not having to separate voice and data, it would increase efficiency by allowing them to carry more voice calls in a data channel than in a traditional voice channel. Qualcomm was able to squeeze up to 30 times more voice calls in a 1.25 MHz channel using VOIP than traditional voice connections in their test.
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So The Envisionaries Are Getting Closer!
I thought it made sense a few years ago and still do to this day.
Its about simplifying the core network
VoIP can give very good quality provided voice traffic is prioritized. If you control the network (regardless if its cable, wireless, or copper cable)then you can priortize traffic. Vonage etc. do not control the network so their quality is crap. A lot enterprise class VoIP providers will also send the traffic on a dedicated and leased voice channel once it leaves their last mile infrastructure or via traditional ATM-based fiber...
But this does provide a number of potential problems:
1) Call quality. Seriously, I've tried Vonage in different locations with vastly different results. On top of that, using it with various phones yields different results - some phones sound like crap; others are fine. And, cramming 30 people on one channel is bound to have quality issues.
2) Dropped calls / Network problems. How well is this going to be handled? Current phones do a good job combating this, but it hasn't always been this good. It wasn't long ago when dropping calls was common.
It will be interesting though.